Nonaqueous electrolyte secondary battery

Abstract

This nonaqueous electrolyte secondary battery is provided with: an electrode body that comprises a first electrode and a second electrode, an electrolyte solution; and an outer package. The first electrode has a rectangular shape, and comprises a collector and a mixture layer that is formed on the surface of the collector; the mixture layer has a first region, a second region and a third region sequentially from one end toward the other end in the short-side direction of the first electrode; the respective widths of the first and the third region in the short-side direction of the first electrode are 1% to 20% of the length of the first electrode in the short-side direction; the mixture layer contains an electrolyte salt; and the respective contents of the electrolyte salt in the first and the third region are higher than the content of the electrolyte salt in the second region.

1 . A non-aqueous electrolyte secondary battery, comprising:
 an electrode assembly including a first electrode and a second electrode that have different polarities from each other;   an electrolyte liquid; and   an exterior housing the electrode assembly and the electrolyte liquid, wherein   the first electrode has a rectangular shape, and has a current collector and a mixture layer formed on a surface of the current collector,   the mixture layer has a first region, a second region, and a third region in this order from one end to the other end in a short direction of the first electrode,   each of a width of the first region and a width of the third region in the short direction of the first electrode is greater than or equal to 1% and less than or equal to 20% of a length of the short direction of the first electrode,   the mixture layer includes an electrolyte salt, and   each of a content rate of the electrolyte salt in the first region and a content rate of the electrolyte salt in the third region is higher than a content rate of the electrolyte salt in the second region.   
     
     
         2 . The non-aqueous electrolyte secondary battery according to  claim 1 , wherein the first electrode and the second electrode are wound via a separator in the electrode assembly. 
     
     
         3 . The non-aqueous electrolyte secondary battery according to  claim 1 , wherein the first electrode is a positive electrode. 
     
     
         4 . The non-aqueous electrolyte secondary battery according to  claim 1 , wherein the electrolyte salt includes lithium hexafluorophosphate. 
     
     
         5 . The non-aqueous electrolyte secondary battery according to  claim 1 , wherein the second region is free of the electrolyte salt.